A cousin of the Tanita BC-502 with Bluetooth and a fat sensor, this Tanita BC-500-SV has a USB port so you can keep track of your weight on a memory stick. Every time you weigh yourself, gazing past your midnight KFC and one-mojito-too-many gut, the scale will record your body weight and fat percentage onto the USB drive.

The included drive can track four users for 30 days, which then gets uploaded to your Windows PC to graph your weight. If you're one of those people who don't find motivation in losing weight unless there's some kind of gimmick or gadget, this may help keep you alive for another 20 years. – Jason Chen